Can you show me support that those in a state of grace cannot approach communion when they know they have done grave matter, but it is venial on account of the other two conditions of mortal sin.
I see no pressing reason that a person in a state of grace would be required to make an act of perfect contrition. Recall 916 is requiring such an act.
Its not a case of either or but both and.
(ie both mortal sins of full culpability and venial sins of grave matter).
As I said, the phrase “grave sin” is more generic than a modern day reading of “mortal sin”.
Even your commentary makes this point which you neglected to mention. See the footnote. Did you read the following page or were you relying on the free version with the page missing?
I see it also references Communio journal where somebody has written an article on this very point. Its a pity I no longer live in a Dominican House of Studies where I could amble over to the library and read it at my leisure.
And you have not commented on the observation that “grave sin” is also used in Canon 915 where it clearly means objective mortal sin…ie grave matter.
So it can mean both.
Conscious of grave sin therefore means not only of full culpability but can also mean being made aware the Church considers the matter grave.
I suggest to you that an irregular failing in a personal commitment to the PP to abstain from sex bars from Communion each and every time without confession. While it seems only a private grave sin it is not by reason of the linkage with the preceding grave matter of public second marriage. It becomes public adultery again.
It is not the same as say, masturbation. This is grave sin objectively also but not public grave like adultery Therefore I would not think mitigated venial occassions strictly are required by 916 to be brought to Confession first. I may be wrong. That has always been the customary practise amongst us.
Card Ratzinger talks about grave sin and 916 here. Its fairly patent the gravity of matter implied by the Canon is that of certain specified public matter. This suggests venial culpability does not provide an escape clause when the grave matter is certain public type sins.
http://www.ewtn.com/library/CURIA/cdfworthycom.htm
It seems considerations of both private and public worthiness are at play in both canons.
Its not all about personal moral culpability when presenting for Communion or giving Communion.